do race high flow cats still smell?
Aug 29, 2007, 11:25 AM
#17
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i will tell you saturday as i will try a testpipe on the dyno to see whats the difference in gains... and noise... however i will be using a resonated testpipe...
similar tests have been made but i wasn't present and the setup was different than mine...
if it is true that i could gain up to 10-15whp especially up top i will keep the testpipe for the "racing" season and use the cat during the winter. if the gains are 5whp or so i will stay with the cat...
similar tests have been made but i wasn't present and the setup was different than mine...
if it is true that i could gain up to 10-15whp especially up top i will keep the testpipe for the "racing" season and use the cat during the winter. if the gains are 5whp or so i will stay with the cat...
Sep 4, 2007, 02:19 PM
#25
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Funny, I dont smell anything and Ive been running no cat on all my vehicles for 7 years? Ive never heard any local car guys complain about the cat delete smell... ever. Only til I came to EVOm
Sep 4, 2007, 02:21 PM
#26
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i have the perrin HFC with invidia 3" downpipe and hks carbon ti catback.
once in a while if it is real hot out, or i have been driving the hell out of the car, i will get a little exhaust smell, not usually inside though, only when i walk around the back. other then that, doesn't stink anymore than stock.
as an added bonus, the perrin hasn't thrown a CEL for me.
once in a while if it is real hot out, or i have been driving the hell out of the car, i will get a little exhaust smell, not usually inside though, only when i walk around the back. other then that, doesn't stink anymore than stock.
as an added bonus, the perrin hasn't thrown a CEL for me.
Sep 4, 2007, 02:44 PM
#27
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Now I don't care about the smell myself but I am still interested in these results.
Sep 17, 2007, 10:16 PM
#30
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The rotten egg smell is due to two things: sulfur in the gas and nickel in the catalytic converter. Nickel in the cat is a good thing in that it reduces emissions. But it will also reduce sulfuric acid (from the sulfur) and produce H2S (rotten egg smell).
Sulfur in gas is supposed to be less than a tenth of a percent according to Federal regulations. However, since it is difficult to remove, the refiners sometimes find it hard to reach that low level (read expensive).
Anyway, it has been a general trend to reduce the amount of nickel in cats. But this also varies.
Hence the smell.
Sulfur in gas is supposed to be less than a tenth of a percent according to Federal regulations. However, since it is difficult to remove, the refiners sometimes find it hard to reach that low level (read expensive).
Anyway, it has been a general trend to reduce the amount of nickel in cats. But this also varies.
Hence the smell.